medmunds 681a4afe6b Sendinblue: fix "invalid headers" error ...

Work around recent (unannounced) Sendinblue API change
that caused "Invalid headers" API error with non-string
custom header values, by converting basic numeric types
to strings. (Borrowed code from SendGrid backend.)

Fixes #288

2022-11-04 16:46:25 -07:00

5.7 KiB

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